A heating non-combustible cigarette cooling unit containing phase change cooling material and heating non-combustible cigarette

Abstract

This invention discloses a heating-not-burning cigarette cooling unit containing a phase change cooling material and a heating-not-burning cigarette. The unit comprises at least a carrier paper and a phase change cooling material coated on the carrier paper. The phase change cooling material is distributed in a non-fully-covering, regular pattern on the carrier paper. The carrier paper coated with the phase change cooling material forms multiple longitudinally extending channels through winding, folding, gathering, bending, and wrinkling, and has a porosity of 40%-90% along the longitudinal direction. The phase change cooling material comprises 55-96 parts by weight of polyethylene glycol, 1-5 parts by weight of in-situ reinforcing material, and 3-40 parts by weight of thermally conductive filler. The heating-not-burning cigarette cooling unit of this invention has the advantages of high latent heat of phase change, low thermal hysteresis effect, high heat absorption efficiency, apparent stability without collapse, and no leakage.

Description

Technical Field

[0001] This invention belongs to the field of cigarette materials, specifically relating to a heating non-combustible cigarette cooling unit containing phase change cooling material and a heating non-combustible cigarette. Background Technology

[0002] Existing e-cigarettes are relatively mature, offering good atomization and a wide variety, but their safety remains a concern. In contrast, heated tobacco products, due to their different heating method compared to traditional cigarettes, can provide a healthier smoking experience while satisfying consumers' sensory needs. Heated tobacco products involve inserting tobacco into a heating device, which then heats the tobacco to release nicotine and other aromatic substances. Heated tobacco products are gaining increasing popularity in the market, with various tobacco companies launching their own products.

[0003] However, the large-scale promotion of heated tobacco products still faces many problems. On the one hand, the heating temperature of heated tobacco products is 200-380℃, which prevents some flavor compounds from being fully released, resulting in an unsatisfactory taste. On the other hand, heated tobacco cigarettes are generally shorter, and to ensure the number of puffs, the filter length is also shortened accordingly. Compared to traditional cigarettes, this makes the smoke more prone to overheating during transmission, resulting in excessively high temperatures when the smoke enters the mouth, causing a burning sensation and a strong feeling of heat and dryness, thus affecting the smoking experience. Furthermore, all tobacco companies' products suffer from poor filter cooling performance. Currently, the commonly used cooling material for heated tobacco products is polylactic acid (PLA) film. However, PLA film has poor mechanical strength, is prone to breakage during folding and gathering, and is thermoplastic, easily deformed by heat, causing the cooling unit to collapse. This affects the cooling unit's support performance for the cigarette, and the deformed PLA film can block part of the smoke passage, affecting the cooling effect and reducing the amount of smoke. Furthermore, the cooling effect of gathered PLA film is limited; the smoke temperature after passing through the gathered PLA film still cannot reach a comfortable temperature for the mouth. Existing phase change material cooling systems based on polyethylene glycol (PEG) are prone to leakage when heated during use, summer storage, or outdoor transportation, affecting the appearance and performance of the product and limiting its application in heated tobacco products. Therefore, finding an economical, safe, environmentally friendly cooling unit with stable cooling performance and quality, and further improving the smoking experience of heated tobacco products, remains a pursuit in this technical field. Summary of the Invention

[0004] The present invention adopts the following technical solution to solve the above problems:

[0005] A heating non-combustible cigarette cooling unit containing a phase change cooling material comprises at least a carrier paper and a phase change cooling material coated on the carrier paper. The phase change cooling material is distributed in a non-full-coverage manner on the carrier paper. The carrier paper coated with the phase change cooling material forms multiple longitudinally extending channels by at least one of the following methods: winding, folding, gathering, bending, and wrinkling, and has a porosity of 40%-90% in the longitudinal direction. The phase change cooling material comprises 55-96 parts by weight of polyethylene glycol, 1-5 parts by weight of in-situ reinforcing material, and 3-40 parts by weight of thermally conductive filler. The polyethylene glycol has a molecular weight of 1500-2500 Da and a melting point of 45-60°C. The in-situ reinforcing material is fully dispersed in the polyethylene glycol matrix and plays a physical reinforcing role in situ, and is selected from cellulose acetate or polylactic acid with a molecular weight of 50,000-150,000.

[0006] In this invention, the carrier paper is selected from Xuan paper, cigarette paper, tipping paper, forming paper, tobacco sheet, cellulose paper, dust-free paper, and ceramic fiber paper.

[0007] In one embodiment of the present invention, the carrier paper is selected from ceramic fiber paper with high thermal conductivity.

[0008] In this invention, the size and thickness of the carrier paper are not limited, and are selected according to the actual needs of the product (such as the required length of the cigarette cooling unit and the diameter of the cigarette bar) and the actual performance of the product.

[0009] In a specific embodiment of the present invention, the length of the carrier paper is preferably 100-300 mm, the width of the carrier paper is preferably 7-28 mm, and the thickness of the carrier paper is preferably 0.05-0.5 mm.

[0010] In this invention, the phase change cooling material is distributed in a non-full-coverage, regular pattern on the carrier paper. "Non-full-coverage" means that the phase change cooling material is not coated on the carrier paper in a completely covering manner (i.e., the coating rate of the phase change cooling material on the carrier paper is always less than 100%), leaving certain blank areas uncovered. "Regular distribution" means that the distribution of the phase change cooling material on the carrier paper is not random, but follows a certain distribution rule, leaving certain blank areas on the carrier paper. The preferred distribution rule is a "uniform distribution rule." The uniform distribution rule means that the phase change cooling material is distributed discretely at equal intervals on the carrier paper, maintaining a certain uniform spacing between them, thereby ensuring that the phase change cooling material in each area of ​​the carrier paper has a consistent coating density, ensuring a uniform effect.

[0011] In this invention, the blank areas, after the carrier paper is wound, folded, gathered, bent, and wrinkled to form a cooling unit, can form multiple longitudinally extending channels, thereby ensuring that the smoke has a certain throughput in the cooling unit, significantly increasing the effective heat exchange area, preventing the problem of reduced cigarette smoke concentration and increased draw resistance, and providing consumers with a good smoking experience. The hollow inner cavity provided by the carrier paper also maintains a certain mechanical rigidity. In addition, when the smoke passes through the longitudinally extending channels, the phase change cooling material in each area of ​​the carrier paper can be heated evenly, thereby obtaining a good cooling effect. Furthermore, the blank areas can provide a certain flow space for the phase change cooling material in the cooling unit during the phase change process, acting as a kind of "flood discharge zone", thereby effectively inhibiting the leakage of polyethylene glycol in the phase change cooling material.

[0012] Furthermore, the distribution of the phase change cooling material on the carrier paper is selected from a uniformly spaced strip structure, a uniformly spaced mesh structure, or a uniform island structure.

[0013] Furthermore, the coating rate of the phase change cooling material on the carrier paper is 30%-90%, preferably 50%-80%. A suitable coating rate ensures that the phase change cooling material can effectively absorb heat and lower temperatures during the use of the product, and the appropriate blank areas retained on the carrier paper provide a good suction experience for consumers by allowing the phase change cooling material to flow and serving as a flue gas channel.

[0014] In this invention, the heated non-combustible cigarette cooling unit containing phase change cooling material has a porosity of 40%-90% along its longitudinal direction. Adjusting the porosity appropriately ensures normal flow of flue gas within the cooling unit and achieves a good and stable cooling effect. In this invention, the porosity is further preferably 60%-90%.

[0015] In this invention, the porosity refers to the percentage of the transverse cross-sectional area occupied by the through holes in the cooling unit.

[0016] In this invention, the term "longitudinal direction" refers to the direction extending along the column axis of the cigarette bar or parallel to the column axis of the bar.

[0017] In this invention, the polyethylene glycol, as a phase change material, can absorb heat and undergo an isothermal phase change (energy storage process) when the temperature is above the phase change point, and undergo a reverse phase change (energy release process) when the temperature is below the phase change point, thus exhibiting strong energy storage and temperature control capabilities. Utilizing the heat storage or release property of polyethylene glycol, it can be used to control or regulate the temperature of the working source or the environment surrounding the material, thereby achieving its specific application functions.

[0018] In this invention, the polyethylene glycol has a molecular weight of 1500-2500 Da and a melting point of 45-60℃. During its solid-to-liquid phase transition, it undergoes an endothermic process. When the melting point of the polyethylene glycol in the phase change cooling material is below 45℃, fluid-like substances will diffuse onto the cooling unit during natural storage and outdoor transportation, affecting preservation and use. When the melting point is above 60℃, the viscosity of the polyethylene glycol in the molten state increases, and the hardness after solidification is too high, reducing the stability of the preparation process and its quality. Selecting polyethylene glycol with this molecular weight distribution and melting point range ensures that it possesses a certain consistency. Combined with in-situ reinforcing materials and thermally conductive fillers, this effectively mitigates deformation and flow within the cooling unit during natural storage and outdoor transportation of the phase change cooling material. Simultaneously, it ensures good fluidity at processing temperatures, appropriate viscosity and hardness after cooling, and overall stable preparation process and quality. Polyethylene glycol with this molecular weight and melting point range is selected. When blended with in-situ reinforcing materials and thermally conductive fillers, the resulting phase change cooling material has a phase change temperature range that is exactly in the suitable temperature range of 50-60℃. It has high heat absorption efficiency and thus has a good heat absorption and cooling effect as a cigarette cooling unit.

[0019] In one embodiment of the present invention, cellulose acetate is selected as an in-situ reinforcing material. As an in-situ reinforcing material, cellulose acetate can be uniformly dispersed in the polyethylene glycol matrix, playing an in-situ reinforcing role of the fiber. Furthermore, the fiber structure distributed in the polyethylene glycol also hinders the flow of polyethylene glycol during thermal phase change, alleviating the flow and leakage of polyethylene glycol.

[0020] In one embodiment of the present invention, polylactic acid with a molecular weight of 50,000 to 150,000 is selected as an in-situ reinforcing material. Polylactic acid with this molecular weight can be melt-blended with polyethylene glycol without phase separation when heated, and dispersed in the polyethylene glycol matrix when cooled due to its high molecular weight, acting as a physical rivet, thereby reinforcing the polyethylene glycol matrix in situ and hindering the flow of polyethylene glycol during thermal phase change, thus alleviating the flow and leakage of polyethylene glycol.

[0021] In this invention, the thermally conductive filler is selected from alumina, magnesium oxide, zinc oxide, aluminum nitride, boron nitride, silicon carbide, silicon dioxide, molybdenum disulfide, thermally conductive carbon powder, thermally conductive graphite, and graphene; the thermally conductive filler can be selected from micron-sized or nano-sized materials. The thermally conductive filler in the phase change cooling material can greatly improve the heat transfer capacity of the polymer matrix, constructing a continuous and uniform heat transfer network, thereby facilitating heat diffusion and achieving a good cooling effect. It also plays a certain role in reinforcement and physical anti-flowing.

[0022] Furthermore, the thermally conductive filler is selected from alumina, aluminum nitride, boron nitride, thermally conductive graphite, and graphene, which have high thermal conductivity.

[0023] In a preferred embodiment of the present invention, the amount of thermally conductive filler added is 10-20 parts by weight.

[0024] In this invention, a flavor enhancer may be selectively added to the phase change cooling material. The main function of the flavor enhancer in this invention is to supplement the aroma of the tobacco and impart unique aroma characteristics to the cigarette. When the smoke passes through the cooling unit, the aroma substances in the flavor enhancer are released after the phase change cooling material absorbs heat, effectively supplementing the aroma of the heated tobacco product and thus improving its taste and comfort.

[0025] In this invention, the flavoring agent can be selected from one or more of the following: tobacco, floral, fruity, tea, herbal, alcoholic, milky, and mint flavoring agents. The preferred tobacco flavoring agent is tobacco essence; the preferred floral flavoring agent is rose essence; the preferred fruity flavoring agent is orange essence; the preferred tea flavoring agent is Tieguanyin tea essence; the preferred herbal flavoring agent is traditional Chinese medicine essence; the preferred alcoholic flavoring agent is baijiu essence; the preferred milky flavoring agent is milk essence; and the preferred mint flavoring agent is mint essence.

[0026] In this invention, the amount of flavor enhancer added is 0-10 parts by weight.

[0027] In this invention, the heated non-combustible cigarette cooling unit containing phase change cooling material is prepared through the following steps:

[0028] (1) Add thermally conductive filler to polyethylene glycol, heat to 60-80℃ and mix evenly to obtain a premix, and then use either the first method or the second method to obtain a phase change cooling material; wherein, the first method uses cellulose acetate as an in-situ reinforcing material, dissolves it in an organic solvent and mixes it evenly with the premix, and then removes the solvent to obtain the phase change cooling material; the second method uses polylactic acid as an in-situ reinforcing material, heats it with the premix to 120-230℃ and mixes it evenly, and then cools it to obtain the phase change cooling material;

[0029] (2) A phase change cooling material is coated on a carrier paper using a thermal transfer method or an inkjet method with controllable coating dosage, so that the phase change cooling material is distributed in a regular interval; wherein, the thermal transfer method involves coating the phase change cooling material regularly on a printing plate, heating the printing plate to 50-80°C, printing the phase change cooling material onto the carrier paper at the corresponding positions using thermal transfer technology, and then cooling it; wherein, the inkjet method involves heating the phase change cooling material and then directly spraying it onto the carrier paper according to a set distribution pattern using inkjet printing technology, and then cooling and drying it.

[0030] (3) The carrier paper coated with phase change cooling material is wound, folded, gathered, bent and wrinkled to form the heating non-combustible cigarette cooling unit.

[0031] The organic solvent used in step (1) may be selected from one or a mixture of two of the following: ethanol, diethyl ether, acetone, tetrahydrofuran, dichloromethane, chloroform, methyl acetate, and dimethylformamide, or a mixture thereof in any proportion. Acetone, a low-boiling-point organic solvent, is preferred.

[0032] In this invention, the mixing method can be selected from mechanical stirring, magnetic stirring, or ultrasound. During the mixing process, appropriate heating can be used to promote the mixing between components.

[0033] In this invention, when using the thermal transfer method, printing processes such as letterpress printing, gravure printing, offset printing, and screen printing can be used to regularly coat the phase change cooling material onto the printing plate. All of these printing processes are mature and well-known in the field, and those skilled in the art can select, master, and operate them based on the technology in the field.

[0034] In this invention, the printing plate can be a relief plate, gravure plate, planographic plate, or stencil plate, depending on the printing process used. The material of the printing plate can be wood, stone, zinc (zinc), aluminum, copper, nickel, steel, glass, metal, magnesium, electroplated multilayer, nylon, plastic, alloy, etc. In this invention, metal printing plates suitable for heating are preferred.

[0035] In some embodiments of the present invention, metal wires or rigid fiber bundles may be incorporated into the carrier paper, which can not only enhance the supporting strength of the carrier paper and improve the heat deformation resistance of the cooling unit and even the entire cigarette, but also play a good role in heat conduction.

[0036] In this invention, the metal wire includes, but is not limited to, iron wire, copper wire, aluminum wire, stainless steel wire, and nickel wire.

[0037] In this invention, the rigid fiber bundle is formed by intertwining, bonding, and spiral twisting rigid fibers; the rigid fibers include, but are not limited to, polypropylene fibers, nylon fibers, polyoxymethylene fibers, ultra-high molecular weight polyethylene fibers, basalt fibers, and glass fibers.

[0038] In this invention, the diameter of the metal wire and rigid fiber bundle is preferably 0.1-1 mm.

[0039] In specific embodiments of the present invention, the composite methods of metal wires or rigid fiber bundles in the carrier paper include, but are not limited to, interlacing, bonding, and covering.

[0040] In some embodiments of the present invention, indentations, depressions, or regular geometric grooves can be provided on the carrier paper. These not only enhance the supporting strength of the carrier paper and improve the heat deformation resistance of the cooling unit and even the entire cigarette, but also increase the capacity of the phase change cooling material to accommodate the phase change cooling material and its bonding strength with the carrier paper, preventing it from falling off during the molding process.

[0041] In some embodiments of the present invention, at least one of metal foil and polymer sheets may be laminated onto the carrier paper. The metal foil includes, but is not limited to, gold foil, silver foil, copper foil, aluminum foil, and tin foil. The polymer sheets include, but are not limited to, polyethylene sheets, polypropylene sheets, polyvinyl chloride sheets, polyethylene terephthalate sheets, polylactic acid sheets, and polyamide sheets. The metal foil and / or polymer sheets, by being laminated and stacked with the carrier paper, can provide further support or thermal conductivity.

[0042] In specific embodiments of the present invention, the composite methods of metal foil and polymer sheet on carrier paper include, but are not limited to, bonding, rolling, plating, electroplating, spraying, chemical vapor deposition (CVD), and vacuum evaporation.

[0043] In this invention, the length of the heated non-combustible cigarette cooling unit containing phase change cooling material is preferably between 7-28 mm.

[0044] In this invention, the phase change cooling material has a phase change temperature range of 50-60℃ and a phase change enthalpy greater than 80J / g. These values ​​can be obtained by measuring the phase change temperature and phase change enthalpy of the phase change cooling material using a differential scanning calorimeter.

[0045] In this invention, the heating non-combustible cigarette cooling unit containing phase change cooling material absorbs more than 2J of heat during use.

[0046] The present invention also discloses a heated non-combustible cigarette, which includes a smoke-generating unit (1), a hollow isolation unit (2), a heated non-combustible cigarette cooling unit (3) containing phase change cooling material as described above, a filter unit (4), and a packaging unit (5) for wrapping the above units.

[0047] In this invention, the smoke-generating unit (1) is formed by vertically arranging and gathering strips or sheets of tobacco material, with irregular air pores densely distributed between the tobacco materials. The tobacco material may be selected from one or more of vanilla leaves, tobacco leaves, tobacco rib fragments, tobacco sheets, homogenized tobacco, extruded tobacco, and expanded tobacco, as well as powders, granules, pellets, fragments, spaghetti-like pieces, strips, or sheets.

[0048] In this invention, the packaging unit (5) is composed of cigarette paper, forming paper, and tipping paper.

[0049] In this invention, the total length of the heated non-combustible cigarette is preferably between 40 and 95 mm.

[0050] The beneficial effects of this invention are as follows:

[0051] 1. The phase change cooling material used in this invention has the characteristics of high latent heat of phase change, low thermal hysteresis effect, high heat absorption efficiency, non-toxicity, non-irritation, and stable performance. It has a certain consistency and good processability, and is not prone to deformation and flow during natural storage and outdoor transportation. As a cigarette cooling unit, it has a good heat absorption and cooling effect. In addition, the physical barrier network formed by the uniformly dispersed in-situ reinforcing material and thermally conductive filler in the phase change cooling material not only reinforces the polyethylene glycol matrix in situ, improving the mechanical properties of the cooling unit and preventing it from collapsing due to heat, but also inhibits the flow of polyethylene glycol during thermal phase change. It also has a blocking effect on the diffusion of harmful substances produced by tobacco combustion, reducing the intake of harmful substances by the human body. Thus, a continuous and uniform heat transfer, barrier, and reinforcing network is constructed, which reduces the temperature of cigarette smoke and greatly enhances the practical value of the phase change material cooling system for heated non-combustible cigarettes.

[0052] 2. The phase change cooling material in this invention is distributed in a non-fully covered, regular pattern on the carrier paper. This regular distribution leaves certain blank areas on the carrier paper. These blank areas, after the carrier paper is rolled, folded, gathered, bent, and wrinkled to form cooling units, can form multiple longitudinally extending channels. This ensures that the smoke has a certain throughput in the cooling unit, preventing the problem of reduced cigarette smoke concentration and increased draw resistance, thus providing consumers with a good smoking experience. The hollow inner cavity provided by the carrier paper also maintains a certain degree of mechanical rigidity. In addition, when the smoke passes through the longitudinally extending channels, the phase change cooling material in each area of ​​the carrier paper can be heated evenly. The smoke can effectively exchange heat with the phase change material, thereby achieving a good cooling effect. Furthermore, the blank areas provide a certain flow space for the phase change cooling material during the phase change process in the cooling unit, thereby effectively suppressing leakage of the phase change cooling material during natural storage and outdoor transportation.

[0053] 3. The overall preparation process of the heating non-combustible cigarette cooling unit containing phase change cooling material adopted in this invention is simple, and it can achieve full dispersion of in-situ reinforcing materials and thermally conductive fillers in polyethylene glycol matrix. Furthermore, it achieves controllable metering and controllable regional coating of phase change cooling material on carrier paper, and the overall preparation process and its quality are stable.

[0054] 4. The phase change cooling material in the heated non-combustible cigarette cooling unit of this invention has a suitable phase change temperature (50-60℃) and a high phase change enthalpy (greater than 80J / g), and has a higher latent heat of phase change per unit mass, realizing a truly practical phase change heat absorption with high heat absorption efficiency. When used as a cigarette cooling unit, it has a good heat absorption and cooling effect. During use, the average temperature of the smoke is reduced by more than 10℃ compared with existing domestic products, effectively reducing the burning sensation of smoke in the mouth and improving the smoking experience of heated non-combustible cigarettes.

[0055] 5. The heated non-combustible cigarette sample of this invention has an intact appearance and does not collapse during use, and there is no leakage on the surface. It solves the problems of poor mechanical strength, easy breakage during the gathering and folding process, easy deformation and collapse when heated, and partial blockage of the smoke passage by polylactic acid film as a cooling material, as well as the leakage problem of polyethylene glycol phase change material system. Attached Figure Description

[0056] Figure 1 This is a schematic diagram showing the phase change cooling material distributed in a uniformly spaced strip structure on a carrier paper in the cooling unit of the heated non-combustible cigarette containing phase change cooling material, as described in this embodiment; where the x-direction is the longitudinal direction and the y-direction is the winding direction.

[0057] Figure 2 This is a schematic diagram showing the phase change cooling material distributed in a uniformly spaced mesh structure on a carrier paper in the heating non-combustible cigarette cooling unit containing phase change cooling material, as described in the embodiment.

[0058] Figure 3 The schematic diagram shows that in the heating non-combustible cigarette cooling unit containing phase change cooling material, the phase change cooling material is distributed in a uniform island-shaped structure on the carrier paper, wherein the island-shaped structure is circular.

[0059] Figure 4 The schematic diagram shows that in the heating non-combustible cigarette cooling unit containing phase change cooling material, the phase change cooling material is distributed in a uniform island-like structure on the carrier paper, wherein the island-like structure is elliptical.

[0060] Figure 5 The schematic diagram shows that in the heating non-combustible cigarette cooling unit containing phase change cooling material, the phase change cooling material is distributed in a uniform island-shaped structure on the carrier paper, wherein the island-shaped structure is oval.

[0061] Figure 6 The schematic diagram shows that in the heating non-combustible cigarette cooling unit containing phase change cooling material, the phase change cooling material is distributed in a uniform island-shaped structure on the carrier paper, wherein the island-shaped structure is rectangular.

[0062] Figure 7The schematic diagram shows that in the heating non-combustible cigarette cooling unit containing phase change cooling material, the phase change cooling material is distributed in a uniform island-shaped structure on the carrier paper, wherein the island-shaped structure is a rounded rectangle.

[0063] Figure 8 The diagram shows the structure of the heated non-combustible cigarette in the embodiment; wherein, (1) is the smoke generating unit, (2) is the hollow isolation unit, (3) is the heated non-combustible cigarette cooling unit containing phase change cooling material, (4) is the filter unit, and (5) is the packaging unit;

[0064] Figure 9 This is a comparison chart of the DSC test results of the phase change cooling materials used in Comparative Example 2 and Example 1.

[0065] Figure 10 This is a screenshot of the smoke temperature of the heated non-combustible cigarette in Example 1 during a simulated smoking test. Detailed Implementation

[0066] The present invention will be further described in detail below through specific embodiments. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Specific processes and equipment not specified in the embodiments are carried out according to the techniques or conditions described or implemented in literature or actual processes and equipment in the art.

[0067] The heating non-combustible cigarette cooling unit containing phase change cooling material in the embodiment includes a carrier paper and a phase change cooling material. The phase change cooling material is coated on the carrier paper and is distributed in a regular pattern on the carrier paper without full coverage. The carrier paper coated with the phase change cooling material forms multiple longitudinally extending channels by means of winding, folding, gathering, bending or pleating.

[0068] Reference for the distribution of phase change cooling material on carrier paper Figures 1 to 7 .

[0069] Figure 1 The phase change cooling material is distributed on the carrier paper in a uniformly spaced strip structure. When using strip coating, the number of coating strips can be selected from 2 to 16, and the width of each strip can be selected from 0.5 to 3 mm; when using wide strip coating, the coating width can be selected from 3 to 20 mm.

[0070] Figure 2 The phase change cooling material is distributed on the carrier paper in a uniformly spaced network structure.

[0071] Furthermore, the phase change cooling material can be uniformly distributed in an island-like structure on the carrier paper. This island-like structure refers to a structure formed by using the phase change cooling material as the dispersed phase and the carrier paper as the continuous phase. The geometric configuration of the island-like structure as the dispersed phase is not limited; it can be a regular or irregular geometric configuration, depending on the product obtained during the actual preparation process. Preferred geometric configurations for the island-like structure include circles, ellipses, oval shapes, ovals, arcs, polygons, rounded polygons, hollow circles, hollow ellipses, hollow oval shapes, hollow polygons, and hollow rounded polygons. More preferred are circles, ellipses, oval shapes, rings, triangles, rectangles, rounded rectangles, rhombuses, squares, and hexagons. The most preferred shape is a circle (e.g., ...). Figure 3 As shown), elliptical (as shown) Figure 4 As shown), oval (as shown) Figure 5 As shown), rectangle (as shown) Figure 6 As shown), rounded rectangle (e.g.) Figure 7 (As shown).

[0072] The oval shape mentioned above refers to a closed shape formed by dividing a circle into two semicircular arcs through the center and translating them in opposite directions, and connecting the endpoints of the two semicircular arcs with two parallel lines of equal length.

[0073] The oval shape refers to an ellipse after tapering, with a longitudinal section similar to an egg, wider at the base and narrower at the head.

[0074] The arc shape refers to a portion of a circle or ellipse, where the planar figure deviates or bends from the horizontal line to resemble an arc or elliptical arc.

[0075] The polygons referred to are planar figures composed of three or more line segments connected end to end in sequence, such as triangles, rectangles, pentagons, and hexagons.

[0076] The term "rounded polygon" refers to a polygon whose corners have a certain degree of roundness.

[0077] Figures 1-7 The carrier paper coated with phase change cooling material is wound, folded, gathered, bent, and wrinkled along the longitudinal axis of the schematic diagram to form a heating non-combustible cigarette cooling unit, which can form multiple channels extending longitudinally along the column axis of the cigarette bar.

[0078] refer to Figure 8 The heated tobacco product includes a smoke-generating unit 1, a hollow isolation unit 2, a heated tobacco cooling unit 3 containing phase change cooling material, a filter unit 4, and a packaging unit 5 used to wrap the above-mentioned units, which are assembled in sequence in the form of a bar.

[0079] Example 1

[0080] 15 parts by weight of boron nitride were added to 80 parts by weight of polyethylene glycol 2,000, and the mixture was heated to 65°C and mixed thoroughly to obtain a premix. 5 parts by weight of cellulose acetate were dissolved in acetone and mixed thoroughly with the premix. The mixture was then placed in an oven at 40°C to remove the solvent and cooled to obtain a phase change cooling material.

[0081] Phase change cooling material is coated onto a metal printing plate using a screen printing process. The screen printing plate has uniformly distributed oval-shaped perforated patterns (major axis diameter 3mm, minor axis diameter 1mm, pattern spacing 1mm). The metal printing plate is heated to 60℃, and ceramic fiber paper is used as the carrier paper. The phase change cooling material is then printed onto the corresponding positions using a heat transfer technique (the distribution of the phase change cooling material on the ceramic fiber paper is as follows). Figure 5 As shown in the figure, the black pattern indicates the location where the phase change cooling material is applied, and then cooling is performed.

[0082] Indentations were made in blank areas of ceramic fiber paper coated with phase change cooling material, and then the paper was wound, folded, and gathered to form the heat-not-burning cigarette cooling unit containing the phase change cooling material. The prepared heat-not-burning cigarette cooling unit was used to prepare heat-not-burning cigarette samples, and its performance was tested.

[0083] Example 2

[0084] 15 parts by weight of boron nitride were added to 81 parts by weight of polyethylene glycol 2,000, and the mixture was heated to 65°C and stirred until homogeneous to obtain a premix. 4 parts by weight of polylactic acid (Hubei Xinyuhong, molecular weight 100,000) were added to the premix and heated to 200°C, stirred until homogeneous, and then cooled to obtain the phase change cooling material.

[0085] Phase change cooling material is coated onto the raised surface of a metal printing plate with uniformly rounded rectangular protrusions (4×2mm in size, with a 2mm interval between protrusions). The metal printing plate is heated to 60℃, and ceramic fiber paper is used as the carrier paper. The phase change cooling material is then printed onto the corresponding positions using heat transfer technology (the distribution of the phase change cooling material on the ceramic fiber paper is as follows). Figure 7 As shown in the figure, the black squares represent the areas where the phase change cooling material is applied, and then cooling is performed.

[0086] A heating-not-burning cigarette cooling unit containing phase change cooling material is fabricated by winding, folding, and gathering ceramic fiber paper coated with phase change cooling material. The fabricated heating-not-burning cigarette cooling unit is then used to prepare heating-not-burning cigarette samples, and its performance is tested.

[0087] Example 3

[0088] 20 parts by weight of alumina were added to 75 parts by weight of polyethylene glycol 2,500, and the mixture was heated to 70°C and stirred until homogeneous to obtain a premix. 5 parts by weight of cellulose acetate were dissolved in acetone and mixed with the premix until homogeneous. The mixture was then placed in an oven at 40°C to remove the solvent and cooled to obtain a phase change cooling material.

[0089] Phase change cooling material is coated onto a metal printing plate using a screen printing process. The screen printing plate has evenly distributed oval-shaped perforated patterns (major axis diameter 3mm, minor axis diameter 1mm, pattern spacing 1mm). The metal printing plate is heated to 65℃, and using forming paper as a carrier paper, the phase change cooling material is printed onto the corresponding positions using heat transfer technology (the distribution of the phase change cooling material on the forming paper is as follows). Figure 5 As shown in the figure, the black pattern indicates the location where the phase change cooling material is applied, and then cooling is performed.

[0090] A heating-not-burning cigarette cooling unit containing phase change cooling material is fabricated by winding, folding, and gathering a pre-formed paper coated with phase change cooling material. The fabricated heating-not-burning cigarette cooling unit is then used to prepare heating-not-burning cigarette samples, and its performance is tested.

[0091] Example 4

[0092] Ten parts by weight of graphene were added to 87 parts by weight of polyethylene glycol 2,000, and the mixture was heated to 65°C and mixed thoroughly to obtain a premix. Three parts by weight of cellulose acetate were dissolved in acetone and mixed thoroughly with the premix. The mixture was then placed in an oven at 40°C to remove the solvent and cooled to obtain a phase change cooling material.

[0093] Phase change cooling material is coated onto the grooves of a metal printing plate with uniformly spaced strip-shaped grooves (grooves are 1 mm wide and 2 mm apart). The metal printing plate is heated to 60°C. Ceramic fiber paper is used as the carrier paper, and several iron wires with a diameter of approximately 0.5 mm are pre-bonded to the paper along the winding, folding, and gathering directions. The phase change cooling material is then printed onto the corresponding positions using heat transfer technology (the distribution of the phase change cooling material on the ceramic fiber paper is as follows). Figure 1 As shown in the figure, the black bars indicate the positions where the phase change cooling material is applied, and then cooling is performed.

[0094] A heating-not-burning cigarette cooling unit containing phase change cooling material is fabricated by winding, folding, and gathering ceramic fiber paper coated with phase change cooling material. The fabricated heating-not-burning cigarette cooling unit is then used to prepare heating-not-burning cigarette samples, and its performance is tested.

[0095] Example 5

[0096] 20 parts by weight of thermally conductive graphite were added to 75 parts by weight of polyethylene glycol 1,500, and the mixture was heated to 60°C and mixed evenly to obtain a premix. 5 parts by weight of cellulose acetate were dissolved in acetone solvent and mixed evenly with the premix. The mixture was placed in an oven at 40°C to remove the solvent, and after cooling, a phase change cooling material was obtained.

[0097] Phase change cooling material is coated onto a metal printing plate using a screen printing process. The screen printing plate has evenly distributed circular cutout patterns (2mm in diameter, 2mm between patterns). The metal printing plate is heated to 55℃, and cigarette paper is used as the carrier paper. The phase change cooling material is then printed onto the corresponding positions using a heat transfer technique (the distribution of the phase change cooling material on the cigarette paper is as follows). Figure 3 As shown in the figure, the black dots indicate the positions where the phase change cooling material is applied, and then cooling is performed.

[0098] Indentations are made in blank areas of cigarette paper coated with phase change cooling material, and then the paper is wound, folded, and gathered to form the heat-not-burning cigarette cooling unit containing the phase change cooling material. The prepared heat-not-burning cigarette cooling unit is used to prepare heat-not-burning cigarette samples, and its performance is tested.

[0099] Example 6

[0100] 20 parts by weight of graphene and 2 parts by weight of rose fragrance were added to 75 parts by weight of polyethylene glycol 2,000, and heated to 65°C to mix evenly to obtain a premix. 3 parts by weight of cellulose acetate were dissolved in acetone and mixed evenly with the premix. The mixture was placed in a 40°C oven to remove the solvent and cooled to obtain a phase change cooling material.

[0101] Xuan paper is selected as the carrier paper, and several iron wires with a diameter of about 0.5 mm are glued to the paper beforehand along the winding, folding, and gathering directions. After heating the phase change cooling material, it is sprayed onto the Xuan paper using inkjet printing technology in a uniform dot distribution pattern (dot diameter 2 mm, dot edge spacing 2 mm). (The distribution pattern of the phase change cooling material on the formed paper is as follows...) Figure 3 As shown in the figure, the black dots indicate the positions where the phase change cooling material is applied, and then it is cooled and dried.

[0102] Xuan paper coated with a phase change cooling material was rolled, folded, and gathered to form a heating-not-burning cigarette cooling unit containing the phase change cooling material. The prepared heating-not-burning cigarette cooling unit was used to prepare heating-not-burning cigarette samples, and its performance was tested.

[0103] Example 7

[0104] Ten parts by weight of boron nitride were added to 86 parts by weight of polyethylene glycol 2,000, and the mixture was heated to 65°C and stirred until homogeneous to obtain a premix. Four parts by weight of polylactic acid (Hubei Xinyuhong, molecular weight 100,000) were added to the premix and heated to 200°C and stirred until homogeneous. The mixture was then cooled to obtain the phase change cooling material.

[0105] Cellulose paper was selected as the carrier paper. The phase change cooling material was heated and then sprayed onto the cellulose paper using inkjet printing technology in a uniform block distribution pattern (rectangle size 4×2mm, rectangle edge spacing 2mm). (The distribution pattern of the phase change cooling material on the forming paper is as follows...) Figure 6 As shown in the figure, the black rectangle indicates the position where the phase change cooling material is applied, and then it is cooled and dried.

[0106] Indentations were made in blank areas of cellulose paper coated with phase change cooling material, and then the paper was wound, folded, and gathered to form the heat-not-burning cigarette cooling unit containing the phase change cooling material. The prepared heat-not-burning cigarette cooling unit was used to prepare heat-not-burning cigarette samples, and its performance was tested.

[0107] Comparative Example 1

[0108] The cigarettes used are the commercially available Fujian Tobacco Jinqiao brand cigarettes.

[0109] Comparative Example 2

[0110] It uses commercially available Marlboro IQOS cigarettes.

[0111] The phase change temperature and phase change enthalpy of the phase change cooling material of the heated non-combustible cigarette cooling unit in the comparative example and various embodiments of the present invention were tested using a differential scanning calorimeter (DSC200F3, NETZSCH, Germany), and the test results are listed in Table 1.

[0112] The heated tobacco products in each comparative example and embodiment were simulated for smoking according to the cigarette smoking model specified in the national standard YC / T29-1996. A K-type thermocouple temperature detector was used to measure the temperature at the center of the cigarette filter rod during smoking. The smoke temperature test results corresponding to the number of puffs are listed in Table 2. The highest and lowest smoke temperatures of each comparative example and embodiment were statistically analyzed. The sensory evaluation of the cigarette samples in each comparative example and embodiment was conducted using the YCT138-1998 cigarette sensory evaluation standard, and the results are listed in Table 3. Figure 9 This is a comparison chart of the DSC test results of the phase change cooling materials used in Comparative Example 2 and Example 1. Figure 10 This is a screenshot of the smoke temperature of the heated non-combustible cigarette in Example 1 during a simulated smoking test.

[0113] Table 1. Phase change temperature and enthalpy of phase change cooling materials in the cooling units of the comparative examples and embodiments of the present invention.

[0114]

[0115]

[0116] Table 2. Flue Gas Temperature Test Results of Comparative Examples and Embodiments of the Invention

[0117] Number of mouths 1 2 3 4 5 6 7 8 Comparative Example 1 54.2 62.0 60.5 57.3 54.4 53.1 53.2 53.1 Comparative Example 2 46.4 50.7 51.9 48.9 45.9 43.3 41.4 40.4 Example 1 47.2 48.3 48.9 47.3 44.1 42.7 40.9 40.4 Example 2 39.8 44.9 49.2 49.7 48.8 45.8 44.0 42.8 Example 3 41.8 51.0 52.3 47.8 45.4 43.3 41.5 39.8 Example 4 42.3 48.2 48.0 46.8 44.7 42.6 39.2 38.7 Example 5 41.8 48.6 51.8 47.1 45.8 44.8 41.5 40.2 Example 6 43.2 47.0 49.6 45.4 44.3 42.6 41.7 38.4 Example 7 44.1 47.2 48.9 50.1 47.8 46.3 41.3 40.6

[0118] Table 3. Comparison of Smoke Temperature Test Results and Sensory Evaluation of Cigarettes in the Comparative Example and Embodiment of the Invention

[0119]

[0120] The data from the above sets show that the phase change cooling material of the heated tobacco cooling unit in the embodiment has a more suitable phase change temperature (50-60℃) and a higher phase change enthalpy (greater than 80J / g) compared to Comparative Example 2. It also exhibits higher latent heat of phase change per unit mass, achieving truly practical phase change heat absorption with high heat absorption efficiency. Therefore, using it as a cigarette cooling unit demonstrates excellent heat absorption and cooling effects. Furthermore, the heated tobacco sample prepared using the heated tobacco cooling unit in the embodiment shows significant improvements in oral comfort, smoke irritation, and burning sensation compared to the Fujian Tobacco control sample. The average gas temperature was reduced by 10-14℃, resulting in a significant improvement in the overall smoking quality of the cigarettes. Compared to Philip Morris's Marlboro cigarettes, the heated tobacco sample of the embodiment also exhibited superior cooling performance. Furthermore, the heated tobacco sample prepared by the heated tobacco cooling unit of the embodiment remained intact and did not collapse during use, with no leakage. This solved the problems of poor mechanical strength, easy breakage during folding and gathering, easy deformation and collapse under heat, and partial blockage of the smoke passage by polylactic acid film as a cooling material, as well as the leakage problem of polyethylene glycol phase change material system.

[0121] The above embodiments illustrate and describe the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cooling unit for heated, non-combustible cigarettes containing a phase change cooling material, characterized in that, The invention comprises a carrier paper and a phase change cooling material. The phase change cooling material is coated on the carrier paper and presents a non-complete, regular distribution on the carrier paper. The carrier paper coated with the phase change cooling material forms multiple longitudinally extending channels by at least one of the following methods: rolling, folding, gathering, bending, and wrinkling, and has a porosity of 40%-90% along the longitudinal direction. The phase change cooling material comprises 55-96 parts by weight of polyethylene glycol, 1-5 parts by weight of in-situ reinforcing material, and 3-40 parts by weight of thermally conductive filler. The polyethylene glycol has a molecular weight of 1500-2500 Da and a melting point of 45-60°C. The in-situ reinforcing material is selected from cellulose acetate or polylactic acid with a molecular weight of 50,000-150,000. The aforementioned heating and non-combustible cigarette cooling unit containing phase change cooling material is prepared through the following steps: (1) Add thermally conductive filler to polyethylene glycol, heat to 60-80℃ and mix evenly to obtain a premix, and then use the first method or the second method to obtain a phase change cooling material; wherein, the first method uses cellulose acetate as an in-situ reinforcing material, dissolves it in an organic solvent and mixes it evenly with the premix, and then removes the solvent to obtain a phase change cooling material; the second method uses polylactic acid as an in-situ reinforcing material, heats it with the premix to 120-230℃ and mixes it evenly, and then cools it to obtain a phase change cooling material; (2) A phase change cooling material is coated on a carrier paper using a thermal transfer method or an inkjet method with controllable coating dosage, so that the coating rate of the phase change cooling material on the carrier paper is 30%-90% and forms a regular interval distribution. (3) The carrier paper coated with phase change cooling material is wound, folded, gathered, bent or wrinkled to form the heating non-combustible cigarette cooling unit.

2. The heated non-combustible cigarette cooling unit containing phase change cooling material according to claim 1, characterized in that, The carrier paper is selected from Xuan paper, cigarette paper, tipping paper, forming paper, tobacco sheet, cellulose paper, dust-free paper or ceramic fiber paper.

3. The heating and non-combustible cigarette cooling unit containing phase change cooling material according to claim 1, characterized in that, The phase change cooling material is distributed on the carrier paper in a manner selected from a uniformly spaced strip structure, a uniformly spaced mesh structure, or a uniform island structure.

4. The heated non-combustible cigarette cooling unit containing phase change cooling material according to claim 3, characterized in that, The geometric configuration of the island-like structure is selected from circles, ellipses, oval, ovals, arcs, polygons, rounded polygons, hollow circles, hollow ellipses, hollow ovals, hollow ovals, hollow polygons, and hollow rounded polygons.

5. The heating and non-combustible cigarette cooling unit containing phase change cooling material according to claim 1, characterized in that, The thermally conductive filler is selected from at least one of alumina, magnesium oxide, zinc oxide, aluminum nitride, boron nitride, silicon carbide, silicon dioxide, molybdenum disulfide, thermally conductive carbon powder, thermally conductive graphite, and graphene.

6. The heating and non-combustible cigarette cooling unit containing phase change cooling material according to claim 1, characterized in that, The carrier paper also contains composite metal wires or rigid fiber bundles.

7. The heating and non-combustible cigarette cooling unit containing phase change cooling material according to claim 1, characterized in that, The carrier paper is also provided with indentations, depressions or regular geometric grooves.

8. The heated non-combustible cigarette cooling unit containing phase change cooling material according to claim 1, characterized in that, The carrier paper is further laminated with at least one of metal foil and polymer film.

9. A heated non-combustible cigarette, characterized in that, It includes a smoke-generating unit (1) assembled in sequence in the form of a bar, a hollow isolation unit (2), a heated non-combustible cigarette cooling unit (3) containing phase change cooling material as described in any one of claims 1-8, a filter unit (4), and a packaging unit (5) used to wrap the above units.

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